Istijono , Bambang Istijono
(2013)
Integrated Sediment Related Disaster (Galodo) Management
in Limau Manis, West Sumatera.
In: the Indonesia - Japan Sabo Workshop - Policy dialogue, 25 Februari 2013, Kementerian Pekerjaan Umum, Jakarta.
Abstract
West Sumatra province with a population of more than 4.8 million people has extensive land about 4:23 million hectares, with a rugged mountainous region with 87% of its area. It has 4 lakes, namely Lake Maninjau, Lake Diatas, Lake Dibawah and Lake Singkarak, and 600 rivers flowing to the west coast and the east coast of Sumatra island. West Sumatra lies on a tectonic plate between the encounter of two major continental plates, fracturing the Eurasian plate and Australia, 250 km to the west of the coastline, and large faults along the Bukit Barisan Sumatra. This province also has four active volcanoes, namely Talang, Tandikek, Merapi and Kerinci.
Some studies reveal there are 58 rivers that are particularly vulnerable to the danger of debris flow. The last flood of debris flow (galodo) happened in West Sumatra, in headwaters of Limau Manis in Padang, in which the river headwaters in the western part of the Bukit Barisan. The river was steep and flows down the west coast of Sumatra (Indian Ocean). In July and September 2012, extraordinary floods in the Limau Manis river had destroyed about 3,000 hectares of irrigated area and damaged some infrastructure around the river. In addition, some units of residential and public facilities had been damaged by flood and four people died.
Restoration that has been done, namely dredging sediments, groundsill development and protection of riverbank is one of the post-flood emergency actions. Rehabilitation of public infrastructure, namely the improvement of irrigation system, the bridge has been built to create secure feeling to the community. Management process of debris flow in Limau Manis river has been carried out on the phases of disaster management, namely emergency response, recovery (rehabilitation and reconstruction), and mitigation for the next extraordinary disaster in the future.
Keywords: debris flow, sediment disaster, recovery
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